Seattle (SEA) to Milwaukee (MKE): On-Time Performance
Data through July 2026
When you fly SEA to MKE matters as much as anything else about the booking: the route swung from 100% on-time in March 2025 to just 70% in August 2024. Across the full period the route averages 84% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 72%), which matters most in the rough months.
- On-time
- 84%
- arrived <15 min late
- Avg delay
- 7 min
- completed flights
- Cancelled
- 0.2%
- Flights/day
- 1.4
- last 12 months
- Duration
- 3h 52m
- scheduled
- Distance
- 1,694 mi
Monthly on-time trend
Best time to fly from SEA to MKE
Aim for departures around 8 a.m. (91% on-time); avoid 6 p.m. departures (72%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 84% | 7 min |
| Tuesday | 82% | 8 min |
| Wednesday | 84% | 7 min |
| Thursdaybest | 88% | 6 min |
| Friday | 87% | 6 min |
| Saturday | 82% | 8 min |
| Sunday | 80% | 9 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft29%
- Airline operations42%
- National airspace system28%
- Weather1%
Frequently asked questions
- How often are flights from SEA to MKE delayed?
- 16% of SEA–MKE flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 7 minutes.
- What is the best time of day to fly from SEA to MKE?
- Departures around 8 a.m. have the best record (91% on-time), while departures around 6 p.m. have the worst (72%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to MKE?
- The scheduled SEA–MKE flight time averages 3h 52m over 1,694 miles. Actual arrival times vary — flights on this route land 15+ minutes late 16% of the time.
- How often are SEA to MKE flights cancelled?
- 0.2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to MKE?
- August 2024 was the roughest month in this dataset, with only 70% of arrivals on time. The best was March 2025 at 100%. If your dates are flexible, that 30-point gap is worth planning around.
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Based on 1,027 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.